Nathaniel h



UNITED STATES PATEN BEIGE.

NATHANIEL H. MCLEAN, OF THE UNITED STATES ARMY.

w1NDow-cURTAIN FIXTURE.

Specification of Letters Patent No. 30,236, dated October 2, 1860.

T 0 all whom it may concern:

Be it known that I, NATHANIEL HENRY MCLEAN, lieutenant U. S. Army, have invented a new and Improved IVindow Curtain or Shade Fixture for Raising and Lowering the Curtain or Shade and Holding the Same at any Height Desired; and I do hereby declare that the following is a full, clear, and exact description of its construction and operation, reference being had to the annexed drawing, making a part of this speciiication and representing a cross-section.

The fixture consists of a case A B C D, in which works a large wheel or roller l, two

small wheels or rollers 2 and 3, a sliding carriage E F Gr H, a spring S, and a rod R, which component parts are arranged and work as follows The large wheel or roller l turns with its axis, which axis turns in holes in the tace and back of the case A B C D, projecting to the front where it is iinished with a square shoulder` O, made to tit a socket in the end of the roller to which the curtain or shade is attached. This large wheel or roller has no other motion than turning with its axis. Immediately above the large wheel or roller l are two small wheels or rollers 2 and 3, which turn on axes passing through the ends of the carriage E F G H, the rollers just clearing the bottom of the carriage and extending below the ends ot' the carriage, so as to press against the large wheel or roller l. rlhese small wheels or rollers have also a movement with the carriage E E G H, which moves up and down in the case A B C D, in which it is fitted so as to just play smoothly.

To the center of the top of the carriage E F Gr H is fastened a rod R, which passes up through a hole in the top of the case A B C D and directs the movement of the carriage. Around the rod R and confined between the tops of the case A B C D and carriage E F G H is a spring S, which pressing the carriage down maintains the friction between the wheels or rollers l, 2, 3 and an endless cord or tape T, which passes over l and under 2 and 3, which cord or tape is directed by passing between the Jface and back of the case A B C D.

Then the cord or tape T is drawn to raise or lower the curtain or shade, the wheels or rollers rotate, and as number 1 turns with its axis the square shoulder O on the end of the axis turns the roller to which the curtain or shade is attached. To any reasonable inequality in the endless cord or tape T the carriage holding the small wheels or rollers will yield, moving upward, being directed as stated by the rod R, and under the pressure of the spring S. The friction is thus preserved regardless of the loss otl thickness from wearing or stretching of the endless cord or tape T. IVhen the endless cord or tape T is not drawn the pressure exerted by the spring S will hold the wheels or rollers stationary and retain the curtain or shade at any height.

That I claim as my invention, and desire to secure by Letters Patent, is-

The large wheel or roller (l) and the two wheels or rollers above it (2 and the sliding carriage E F Gr H, the spring (S) and rod (R) when arranged and combined substantially as and for the purpose specitied NATHANIEL HENRY MGLEAN.

Vitnesses E. T. MYER, IV. Gr. MYER. 

